To begin, speak to The Assassin (Ling) on the island of Aminishi. She asks for help finding the monk, Yulong, but keeps her reasons secret. Ling suggests fighting the Acolytes of Seiryu on the northern portion of Aminishi to obtain clues.

Once all three books have been obtained and read, return to the southern shore and speak to Ling. You must speak to Ling before you can interact with Yulong. Then, with a few Spirit dragon charms in your inventory, head to the centre of the island, near the Sakadagami. Interact with the dragon statue to be sent to the Spirit Realm. A Spirit dragon charm is consumed per minute spent in the Spirit Realm. Run to the southern shore of the island (where Ling stood before) and speak to Yulong. Charms aren't consumed while you're talking to him. You must decide to either tell Ling where he is or agree to keep him hidden.

Once you finish speaking to Yulong, return to the statue and exit the Spirit Realm. Run back to the beach and speak to Ling. Depending on your earlier choice, you will either reveal Yulong's location or keep it a secret. Ling admits that Yulong was not a target for her to assassinate, but rather a childhood friend and ex-member of the Death Lotus assassin. Finish your conversation with Ling to complete the mini-quest.